What is the percent composition of KClO4?

Answer 1

K = 39.1 g/mol

Cl = 35.5 g/mol

O = 16 g/mol

1K = 39.1

1Cl = 35.5

4O = 64

Sum = 138.6 g/mol of KClO4

% composition is...

39.1 / 138.6 (x100%) = 28.2% K

35.5 / 138.6 (x100%) = 25.6% Cl

64 / 138.6 (x100%) = 46.2% O